From 979d6e7d77b17e94defc29515180cc75d3560383 Mon Sep 17 00:00:00 2001
From: Zeling Feng <zeling@google.com>
Date: Fri, 30 Jul 2021 15:38:51 -0700
Subject: Support RTM_DELLINK

This change will allow us to remove the default link in a packetimpact test so
we can reduce indeterministic behaviors as required in https://fxbug.dev/78430.
This will also help with testing #1388.

Updates #578, #1388.

PiperOrigin-RevId: 387896847
---
 pkg/tcpip/stack/stack.go | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'pkg/tcpip/stack/stack.go')

diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go
index 81fabe29a..c73890c4c 100644
--- a/pkg/tcpip/stack/stack.go
+++ b/pkg/tcpip/stack/stack.go
@@ -780,6 +780,9 @@ func (s *Stack) removeNICLocked(id tcpip.NICID) tcpip.Error {
 	if !ok {
 		return &tcpip.ErrUnknownNICID{}
 	}
+	if nic.IsLoopback() {
+		return &tcpip.ErrNotSupported{}
+	}
 	delete(s.nics, id)
 
 	// Remove routes in-place. n tracks the number of routes written.
-- 
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